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A Chevrolet Sail’s electric cooling fan independently monitors engine or AC temperature and activates only when needed—unlike belt-driven fans tied to engine speed—delivering responsive cooling during idling or stop-and-go traffic while reducing parasitic drag on the engine, thereby freeing up horsepower and improving fuel efficiency. Its quieter operation and longer service life, due to fewer mechanical parts, also enhance overall reliability , and it supports consistent air-con performance by running continuously when the AC is engaged .